Aerosol-generating apparatus

ABSTRACT

An aerosol-generating apparatus is provided. The aerosol-generating apparatus includes a heating base and a heating member. The heating base has a heating cavity, the heating member is configured to accommodate and heat an aerosol-generating substrate, the heating member is disposed in the heating cavity. The heating member includes a first sidewall, a first airflow channel is formed between the first sidewall and the inner surface of the heating cavity. A protrusion is disposed on an inner surface of the first sidewall, the protrusion makes a second airflow channel formed between the first sidewall and the aerosol-generating substrate, and both the first airflow channel and the second airflow channel are led from the outside of the aerosol-generating apparatus to the bottom of the heating cavity.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of International Application No. PCT/CN2021/140860, filed on Dec. 23, 2021, which claims priority to Chinese Patent Application No. 202120286345.3, filed on Jan. 29, 2021. The disclosure of both of the aforementioned applications are hereby incorporated by reference in their entireties.

TECHNICAL FIELD

The present disclosure relates to the field of aerosol-generating technologies, and in particular, to an aerosol-generating apparatus.

BACKGROUND

Traditional products produce aerosols by burning, and when baked at a high temperature of more than 800° C., a large quantity of harmful substances are easily volatilized. In order to meet the needs of people and reduce the harm caused by the harmful substances caused by burning, an aerosol-generating apparatus of a “heat-not-burn” type emerges.

The aerosol-generating apparatus of the “heat-not-burn” type generates aerosols by heating and baking different forms of aerosol-generating substrates (such as grass leaf materials), and transmits the aerosol to a user for inhalation. In this “heat-not-burn” manner, the aerosol-generating substrate is heated only at a lower temperature (200° C.-400° C.), does not burn and does not generate an open flame, and effectively avoids generation of a harmful substance caused by the aerosol-generating substrate.

Currently, electromagnetic induction heating or resistive material heating is commonly used in the “heat-not-burn” aerosol-generating apparatus. The electromagnetic induction heating is as follows: A coil is disposed around a heating member that contains the aerosol-generating substrate, the heating member heats up by means of electromagnetic induction, heat is conducted to the aerosol-generating substrate, and baking and heating are performed on the aerosol-generating substrate.

The aerosol-generating substrate is usually formed into a close fit with the heating member for baking and heating. Because electromagnetic induction heating efficiency is fast, the heating member can reach a very high temperature at a moment, and the outer periphery of the aerosol-generating substrate that is in direct contact with the heating member can easily reach a high temperature. However, because inner heat transfer efficiency of the aerosol-generating substrate is low, baking of the inner aerosol-generating substrate is insufficient, and temperature distribution of the inner and outer periphery of the aerosol-generating substrate is uneven.

SUMMARY

According to the aerosol-generating apparatus provided in the present disclosure, the aerosol-generating apparatus can resolve the problem that the inner and outer peripheral temperatures are uneven when the aerosol-generating substrate is heated.

In order to resolve the foregoing technical problem, the present disclosure adopts a technical solution as follows: An aerosol-generating apparatus is provided. The aerosol-generating apparatus includes a heating base and a heating member. The heating base has a heating cavity; and the heating member is configured to accommodate and heat an aerosol-generating substrate, where the heating member is disposed in the heating cavity; where the heating member includes a first sidewall, and a first airflow channel is formed between the first sidewall and the inner surface of the heating cavity; and a protrusion is disposed on the inner surface of the first sidewall, the protrusion makes a second airflow channel formed between the first sidewall and the aerosol-generating substrate, and both the first airflow channel and the second airflow channel are led from the outside of the aerosol-generating apparatus to the bottom of the heating cavity.

The proportion of the area of the surface of the protrusion for contacting the aerosol-generating substrate to the area of the inner surface of the first sidewall is 5%-15%.

The maximum height of the protrusion is 2 mm-5 mm.

The first sidewall is disposed in a ring shape; and the protrusion is spirally disposed on the inner surface of the first sidewall; or a plurality of strip-shaped protrusions are disposed on the inner surface of the first sidewall at intervals in the circumferential direction; or a plurality of arcuate protrusions are disposed on the inner surface of the first sidewall at intervals in the circumferential direction; or a plurality of dotted protrusions are distributed in an array on the inner surface of the first sidewall; or a plurality of annular protrusions are disposed on the inner surface of the first sidewall at intervals in the axial direction, and each annular protrusion has a groove or a through hole.

The first sidewall portion is concave to form the protrusion.

The first sidewall is disposed in a ring shape, and the heating member is disposed coaxially with the heating base.

The heating base includes a second sidewall, a first limiting member is disposed between the first sidewall and the second sidewall, and the first limiting member spaces the first sidewall from the second sidewall to form the first airflow channel between the first sidewall and the inner surface of the heating cavity.

The outer surface of the first sidewall protrudes to form the first limiting member; and/or the inner surface of the second sidewall protrudes to form the first limiting member.

The heating base includes a second sidewall and a bottom wall, and the second sidewall and the bottom wall enclose to form the heating cavity; and a third airflow channel is formed between the bottom wall and the aerosol-generating substrate, and the third airflow channel communicates with the first airflow channel and the second airflow channel.

A first limiting member is disposed between the first sidewall and the second sidewall, and the first limiting member is configured to limit the heating member for the third airflow channel to communicate with the first airflow channel.

The first sidewall abuts against the bottom wall, and the end of the first sidewall close to the bottom wall has an opening for the third airflow channel to communicate with the first airflow channel.

The bottom wall or the first sidewall or the second sidewall is provided with a second limiting member; and the second limiting member spaces the aerosol-generating substrate from the bottom wall to form the third airflow channel.

Beneficial effects of the present disclosure are as follows:

According to the aerosol-generating apparatus provided in the present disclosure, a first airflow channel and a second airflow channel are disposed on two sides of a heating member, and the second airflow channel is protruded to change a heat transfer mode of the heating member for the aerosol-generating substrate from heat conduction to a combination of heat conduction and heat convection, where heat convection takes a main heat transfer manner. Heat transfer efficiency of heat convection is lower than heat transfer efficiency of heat conduction, and therefore, the heat transfer rate of the heat from the heating member to the outer periphery of the aerosol-generating substrate can be effectively slowed down. In addition, a cold airflow passes through the first airflow channel and the second airflow channel, so that the heating rate of air in the first airflow channel and the second airflow channel can be slower, and the heat transfer rate of the heating member to the outer periphery of the aerosol-generating substrate is close to the heat transfer rate of the outer periphery of the aerosol-generating substrate to the inside. Therefore, the temperature difference between the inner and outer periphery of the aerosol-generating substrate is effectively reduced, thereby resolving the problem of uneven temperature between the inner and outer periphery of the aerosol-generating substrate during heating.

BRIEF DESCRIPTION OF THE DRAWINGS

To describe the technical solutions of the embodiments of the present disclosure more clearly, the following briefly introduces the accompanying drawings. Apparently, the accompanying drawings in the following description show only some embodiments of the present disclosure, and a person of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an aerosol-generating apparatus according to one or more examples of the present disclosure;

FIG. 2 is a schematic diagram of a sectional structure of an aerosol-generating apparatus according to one or more examples of the present disclosure;

FIG. 3 is an enlarged schematic structural diagram of A in FIG. 2 ;

FIG. 4 is a schematic structural diagram of assembly of an aerosol-generating apparatus and an aerosol-generating substrate assembly according to one or more examples of the present disclosure;

FIG. 5 is a schematic diagram of a sectional structure of assembly of an aerosol-generating apparatus and an aerosol-generating substrate according to one or more examples of the present disclosure;

FIG. 6 is a schematic diagram of another sectional structure of assembly of an aerosol-generating apparatus and an aerosol-generating substrate according to one or more examples of the present disclosure;

FIG. 7 is a schematic diagram of a flow path of an airflow in an aerosol-generating apparatus according to one or more examples of the present disclosure;

FIG. 8 is a schematic structural diagram of a heating member according to one or more examples of the present disclosure;

FIG. 9 is another schematic structural diagram of a heating member according to one or more examples of the present disclosure;

FIG. 10 is another schematic structural diagram of a heating member according to one or more examples of the present disclosure;

FIG. 11 is another schematic structural diagram of a heating member according to one or more examples of the present disclosure; and

FIG. 12 is another schematic structural diagram of a heating member according to one or more examples of the present disclosure.

DETAILED DESCRIPTION

The technical solutions in the embodiments of the present disclosure are clearly and completely described in the following, with reference to the accompanying drawings. Apparently, the described embodiments are merely some rather than all of the embodiments of the present disclosure. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts shall fall within the protection scope of the present disclosure.

In the following description, for the purpose of illustration rather than limitation, specific details such as the specific system structure, interface, and technology are proposed to thoroughly understand the present disclosure.

The term “and/or” in this specification is merely an association relationship for describing associated objects, and indicates that there may be three relationships. For example, A and/or B may indicate: the following three cases: Only A exists, both A and B exist, and only B exists. In addition, the character “/” in this specification generally indicates an “or” relationship between the associated objects. In addition, “a plurality of” in this specification means two or more than two.

The terms “first”, “second”, and “third” in the present disclosure are merely intended for a purpose of description, and shall not be understood as an indication or implication of relative importance or implicit indication of the number of indicated technical features. Therefore, features defining “first”, “second”, and “third” can explicitly or implicitly include at least one feature. In description of the present disclosure, “plurality of” means at least two, such as two and three unless it is specifically defined otherwise. All directional indications (for example, up, down, left, right, front, back . . . ) in the embodiments of the present disclosure are only used for explaining relative position relationships, movement situations, or the like between the various components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications change accordingly. In the embodiments of the present disclosure, the terms “include”, “have”, and any variant thereof are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but further optionally includes a step or unit that is not listed, or further optionally includes another step or component that is intrinsic to the process, method, product, or device.

Embodiment mentioned in the specification means that particular features, structures, or characteristics described with reference to the embodiment may be included in at least one embodiment of the present disclosure. The term appearing at different positions of this specification may not refer to the same embodiment or an independent or alternative embodiment that is mutually exclusive with another embodiment. A person skilled in the art explicitly or implicitly understands that the embodiments described in the specification may be combined with other embodiments.

The following describes the present disclosure in detail with reference to the accompanying drawings and embodiments.

It should be noted in advance that generally, the outside of an aerosol-generating substrate has a housing. For example, the outside is provided with a paper package, but to make the description of the embodiments more simplified, the aerosol-generating substrate described below generally refers to an aerosol-generating substrate including a housing.

Referring to FIG. 1 to FIG. 4 , FIG. 1 is a schematic structural diagram of an aerosol-generating apparatus 10 according to the present disclosure, FIG. 2 is a schematic diagram of a sectional structure of the aerosol-generating apparatus 10 in FIG. 1 , FIG. 3 is an enlarged schematic structural diagram of FIG. 2 at A, and FIG. 4 is a schematic structural diagram of cooperation between the aerosol-generating apparatus 10 and an aerosol-generating substrate 11.

In this embodiment, the aerosol-generating apparatus 10 is provided. The aerosol-generating apparatus 10 may be configured to heat and bake the aerosol-generating substrate 11 and generate an aerosol for a user to inhale. The aerosol-generating apparatus 10 includes a housing 12 and a heating switch 13. The heating switch 13 is disposed on the outer surface of the housing 12, and is configured to control on and off of the aerosol-generating apparatus 10. Various components of the aerosol-generating apparatus 10 are disposed in the housing 12. In this embodiment, the shape of the housing 12 is a cylindrical shape. In another embodiment, the housing 12 may also be in another shape. The housing 12 may be made of the same material, or may be made of a plurality of materials. For example, the housing 12 includes a plastic outer layer and a metal inner layer, and the user can only contact the plastic outer layer when using it. Heat generated inside the aerosol-generating apparatus 10 is evenly distributed in the metal inner layer by using the property of rapid heat conduction of the metal, so as to prevent the plastic outer layer touched by the user from being overheated and hot, and further prevent softening of the plastic outer layer.

The aerosol-generating apparatus 10 further includes an vaporizer 14, a battery assembly 15, and a controller 16. The vaporizer 14 is electrically connected to the battery assembly Specifically, the top of the housing 12 has a first opening 121, the inside of the housing 12 has a mounting cavity 122, both the vaporizer 14 and the battery assembly 15 are disposed in the mounting cavity 122, and the vaporizer 14 is disposed on the side that is of the battery assembly and that is close to the first opening 121. The vaporizer 14 is configured to heat and bake the aerosol-generating substrate 11 and generate an aerosol, and the battery assembly 15 is configured to provide a power supply for the vaporizer 14.

Further, the vaporizer 14 includes a heating base 17, a coil 18, and a heating member 19. The controller 16 is disposed on the side that is of the battery assembly 15 and that is close to the first opening 121, and the controller 16 is electrically connected to the coil 18, the heating switch 13, and the battery assembly 15. The controller 16 is configured to control start and stop of electromagnetic induction heating of the coil 18 and the heating member 19, and can control parameters such as the heating power and temperature. When the user needs to use the aerosol-generating apparatus 10, the heating switch 13 of the housing 12 may be pressed. When the controller 16 receives a use request from the user, the battery assembly 15 is controlled to supply power to the coil 18, so that the coil 18 and the heating member 19 electromagnetically inductively heat the aerosol-generating substrate. When the user presses the heating switch 13 of the housing 12 again, the controller 16 receives a stop using request of the user, and controls the battery assembly 15 to stop supplying power to the coil 18, and the coil 18 stops working. The controller 16 further has another function, and details are not described herein.

The heating base 17 is configured to fix the aerosol-generating substrate 11. The heating base 17 is disposed at the end of the mounting cavity 122 close to the first opening 121, and the heating base 17 has a bottom wall 171 and a second sidewall 172. In this embodiment, the second sidewall 172 of the heating base 17 is disposed in a ring shape and is shaped as a cylinder, the second sidewall 172 is disposed at the end of the bottom wall 171 close to the first opening 121, and the second sidewall 172 and the bottom wall 171 of the heating base 17 enclose to form the heating cavity 173. The thickness of the bottom wall 171 is greater than the thickness of the second sidewall 172, so that the structural strength of the heating base 17 is higher. Further, the second sidewall 172 and the bottom wall 171 are integrally formed, and the material of the second sidewall 172 and the bottom wall 171 may be a thermally conductive material such as a metal or an alloy.

The top of the second sidewall 172 of the heating base 17 abuts against the top of the housing 12, and the heating base 17 is coaxially disposed with the housing 12. The end that is of the second sidewall 172 and that is close to the first opening 121 has a second opening 174, and the caliber of the second opening 174 is greater than or equal to the caliber of the first opening 121. Therefore, the heating base 17 separates the mounting cavity 122 from the heating cavity 173, and the heating cavity 173 communicates with the outside of the aerosol-generating apparatus 10 by using the second opening 174 and the first opening 121.

In this embodiment, the caliber of the second opening 174 is the same as the caliber of the first opening 121 and less than the inner diameter of the second sidewall 172, and shapes of both the second opening 174 and the first opening 121 are circular. In another embodiment, the heating base 17 is not limited to the structure described in this embodiment.

The coil 18 is configured to heat the aerosol-generating substrate 11. In this embodiment, the coil 18 is sleeved on the outer periphery of the second sidewall 172 of the heating base 17, so as to heat the aerosol-generating substrate 11 in the heating member 19. In this embodiment, the coil 18 is a coil that is spirally wound, and an eddy current is generated when a changing magnetic field generated after the coil is energized penetrates the heating member 19 of the metal, so that the heating member 19 of the metal heats up and heats the aerosol-generating substrate. In another embodiment, another heating manner may be used to heat the aerosol-generating substrate 11, for example, a resistance wire.

The heating member 19 is disposed in the heating cavity 173. The heating member 19 includes a first sidewall 191. Further, the first sidewall 191 of the heating member 19 is annularly disposed, and one end of the first sidewall 191 close to the second opening 174 has a third opening 192. Therefore, the inside of the heating member 19 communicates with the heating cavity 173, and communicates with the outside of the aerosol-generating apparatus 10.

Referring to FIG. 4 , FIG. 5 , and FIG. 6 , the heating member 19 is configured to accommodate and heat the aerosol-generating substrate 11, and the aerosol-generating substrate 11 may be disposed inside the heating member 19. When the user uses the aerosol-generating apparatus 10, the aerosol-generating substrate 11 is inserted from the first opening 121 of the aerosol-generating apparatus 10, and is disposed inside a heat conductive body by successively passing through the second opening 174 of the heating base 17 and the third opening 192 of the heating member 19.

In this embodiment, the shape of the heating member 19 may be a cylindrical shape, or certainly, may be another shape, such as a cylinder-like shape or a cube. The heating member 19 is coaxial with the heating base 17. Therefore, the coil 18 can evenly heat the outer periphery of the first sidewall 191, and further can evenly heat the outer periphery of the aerosol-generating substrate 11.

Referring to FIG. 3 and FIG. 7 , FIG. 7 is a schematic diagram of a flow path of an airflow in the aerosol-generating apparatus 10 according to the present disclosure. Further, a protrusion 193 is provided on the inner surface of the first sidewall 191 of the heating member 19. A part of the surface of the protrusion 193 is in contact with the outer periphery of the aerosol-generating substrate 11, and heat is transferred to the aerosol-generating substrate 11 in a heat conduction manner. When the aerosol-generating substrate 11 is disposed inside the heating member 19, the protrusion 193 of the first sidewall 191 can make the gap between the aerosol-generating substrate 11 and the inner surface of the first sidewall 191, and form a second airflow channel 20. The second airflow channel 20 is led from the outside of the aerosol-generating apparatus 10 to the bottom of the heating cavity 173, so that air flows from the third opening 192 into the second airflow channel 20, flows to the bottom of the heating cavity 173 through the second airflow channel 20, and finally flows to the end that is of the aerosol-generating substrate 11 and that is away from the third opening 192. When the airflow flows through the protrusion 193 on the first sidewall 191, the airflow flows from both sides of the protrusion 193 to the bottom of the aerosol-generating substrate 11.

There is a gap between the outer surface of the first sidewall 172 and the inner surface of the heating cavity 173, so that the outer surface of the first sidewall 172 and the inner surface of the heating cavity 173 form the first airflow channel 21. The first airflow channel 21 is led from the outside of the aerosol-generating apparatus 10 to the bottom of the heating cavity 173, so that air flows from the second opening 174 into the second airflow channel 20, flows to the bottom of the heating cavity 173 through the second airflow channel 20, and finally flows to the end that is of the aerosol-generating substrate 11 and that is away from the third opening 192.

In this embodiment, the second airflow channel 20 and the protrusion 193 are disposed to change the heat transfer mode of the heating member 19 to the aerosol-generating substrate 11 from heat conduction to a combination of heat conduction and heat convection, and heat convection takes a main heat transfer manner. Heat transfer efficiency of heat convection is lower than heat transfer efficiency of heat conduction, and therefore, the heat transfer rate of the heat from the heating member 19 to the outer periphery of the aerosol-generating substrate 11 can be effectively slowed down. Therefore, the heat transfer rate of the heating member 19 to the outer periphery of the aerosol-generating substrate 11 is close to the heat transfer rate of the outer periphery of the aerosol-generating substrate 11 to the inside. Therefore, the temperature difference between the inner and outer periphery of the aerosol-generating substrate 11 is effectively reduced, thereby resolving the problem of uneven temperature between the inner and outer periphery of the aerosol-generating substrate 11 during heating.

The first airflow channel 21 and the second airflow channel 20 are disposed on two sides of the heating member 19, so that the heating rate of air in the first airflow channel 21 and the second airflow channel 20 is slower. The airflow flows from the outside of the aerosol-generating apparatus 10 through the first airflow channel 21 and the second airflow channel 20 to the bottom of the heating cavity 173, and heat in the first airflow channel 21 and the second airflow channel 20 is taken away, so that heat generated by the heating member 19 and heat radiated by the first sidewall 191 on the inner surface of the heating base 17 are reduced. Therefore, the heat transfer rate of the heat to the outer periphery of the aerosol-generating substrate 11 is slower, the temperature difference between the outer periphery of the aerosol-generating substrate 11 and the inside of the aerosol-generating substrate 11 is smaller, and uniformity of temperature distribution between the inner periphery and the outer periphery of the aerosol-generating substrate 11 is better, thereby resolving the problem of uneven temperature between the inner and outer periphery of the aerosol-generating substrate during heating.

In addition, cold air flows through the first airflow channel 21 and the second airflow channel 20, and takes away some heat in the first airflow channel 21 and the second airflow channel 20, so that heat transferred by the heating cavity 173 to the housing 12 of the aerosol-generating apparatus 10 is reduced, and therefore, the housing 12 of the aerosol-generating apparatus 10 can be insulated.

In addition, the first airflow channel 21 and the second airflow channel 20 are disposed on two sides of the heating member 19, so that flow of the airflow in the heating cavity 173 can be increased, and the airflow can simultaneously flow from two sides of the first sidewall 191. Therefore, the inhalation resistance inside the aerosol-generating apparatus 10 is smaller, and the user inhales more easily when using the aerosol-generating apparatus 10.

The protrusion 193 can further reduce the contact area between the heating member 19 and the aerosol-generating substrate 11, and an aerosol condensate is less likely to adhere to the first sidewall 191, thereby reducing adhesion of stains on the heating member 19. In an implementation, when the housing of the aerosol-generating substrate 11 is a paper outer wall, the arrangement of the protrusion 193 can also reduce the contact area between the heating member 19 and the paper outer wall, so as to prevent the paper outer wall from being baked and pasted due to overheating, prevent a pungent smell from forming, and improve user experience.

In an implementation, the area of the surface that is of the protrusion 193 and that is in contact with the aerosol-generating substrate 11 is in a ratio of 5%-15% to the area of the inner surface of the first sidewall 191, for example, the ratio may be 5%, 10%, or 15%. The surface that is of the protrusion 193 and that is in contact with the aerosol-generating substrate 11 means: the surface that is of one end of the protrusion 193 and that is in contact with the surface of the aerosol-generating substrate 11 when the aerosol-generating substrate 11 is disposed in the heating member 19. The smaller the area ratio of the contact surface to the inner surface of the first sidewall 191 is, that is, the smaller the heat transfer area of the heat conduction is, in the common heat transfer manner, the smaller the proportion of heat conduction to heat convection is. When the proportion of the area ratio is between 5%-15%, heat convection is the main heat transfer mode in the common heat transfer mode, and the heat transfer rate of the heat to the aerosol-generating substrate 11 is greatly reduced. Because the heat transfer rate between the aerosol-generating substrate 11 and the first sidewall 191 is reduced, the heat transfer rate of the heating member 19 toward the outer periphery of the aerosol-generating substrate 11 is gradually similar to the heat transfer rate of the outer periphery of the aerosol-generating substrate 11 toward the inside of the aerosol-generating substrate 11, and the temperature difference between the inner and outer periphery of the aerosol-generating substrate 11 is reduced, thereby effectively resolving the problem of uneven distribution of the inner and outer temperatures of the aerosol-generating substrate 11 during heating. In some cases, the heat transfer rate inside the aerosol-generating substrate 11 is greater than the heat transfer rate between the heating member 19 and the outer periphery of the aerosol-generating substrate 11, and the temperature difference between the inside and outside of the aerosol-generating substrate 11 after heating for a period of time tends to 0, and the inner and outer periphery temperature are more evenly distributed.

The area ratio of the contact surface to the inner surface of the first sidewall 191 cannot be too high or too low, and when the area ratio is too high, the proportion of heat convection in the common heat transfer manner is reduced, and the heat transfer rate of the heat to the aerosol-generating substrate 11 cannot be reduced. Too low an area ratio makes the proportion of heat conduction too low and the heating effect not good.

In this embodiment, a part of the first sidewall 191 is concave toward the aerosol-generating substrate 11 to form the protrusion 193. In this manner, a mold is used to stamp and form the protrusion 193 from the outer surface of the first sidewall 191 to the inside of the first sidewall 191. A processing process of the protrusion 193 is simple, and costs are relatively low. In another embodiment, the protrusion 193 may be a bump, and the bump is disposed on the inner surface of the first sidewall 191. The material of the bump may be the same as that of the first sidewall 191, and the bump and the first sidewall 191 are integrally formed. The bump may alternatively be made of a material different from that of the first sidewall 191, and the bump may be made of a material with relatively poor heat conductivity. Therefore, when the heat is transferred from the protrusion 193 to the aerosol-generating substrate 11 in the heat conduction manner, because heat conductivity of the bump is relatively poor, the speed of heat conduction may be reduced, so that the heat transfer rate of the heating member 19 to the outer periphery of the aerosol-generating substrate 11 and the heat transfer rate of the outer periphery of the aerosol-generating substrate 11 to the inside of the aerosol-generating substrate 11 are closer to each other. Therefore, the temperature difference between the inner and outer periphery of the aerosol-generating substrate 11 is effectively reduced, and the temperature of the inner and outer periphery of the aerosol-generating substrate 11 is more uniform.

In an implementation, the maximum height of the protrusion 193 is 2 mm-5 mm. The maximum height of the protrusion 193 refers to the maximum height at which the protrusion 193 protrudes relative to the inner surface of the first sidewall 191. The maximum height of the protrusion 193 may be adjusted to adjust the width of the gap between the heating member 19 and the aerosol-generating substrate 11, so as to control the size of the airflow in the second airflow channel 20, thereby achieving the effect of adjusting the inhalation resistance. The smaller the maximum height of the protrusion 193, the larger the inhalation resistance. Conversely, the larger the maximum height of the protrusion 193, the smaller the inhalation resistance.

There may be one or more protrusions 193, and one protrusion 193 may be spirally disposed on the inner surface of the first sidewall 191. A plurality of protrusions 193 may be circumferentially distributed on the inner surface of the first sidewall 191, and/or a plurality of protrusions 193 are axially distributed on the inner surface of the first sidewall 191. The greater the quantity of protrusions 193, the greater the proportion of heat conduction between the heating member 19 and the aerosol-generating substrate 11 in the common heat transfer of heat conduction and heat convection. When there are three or more protrusions 193, the plurality of protrusions 193 may be evenly distributed along the circumferential direction at intervals, and the plurality of protrusions 193 are in contact with the peripheral edge of the aerosol-generating substrate 11, so as to limit the aerosol-generating substrate 11.

The shape of the protrusion 193 may be a regular shape, such as a strip shape, a dot shape, or a ring shape, or may be an irregular shape. In the present disclosure, FIG. 8 to FIG. 11 provide four types of heating members 19 with different shapes and distributed protrusions 193.

The protrusion 193 in FIG. 8 is strip-shaped, and the strip-shaped protrusion 193 extends from the third opening 192 to the end facing away from the third opening 192, that is, extends from the top of the first sidewall 191 to the bottom. The plurality of strip-shaped protrusions 193 are distributed on the inner surface of the first sidewall 191 at intervals in the circumferential direction. Specifically, the four strip-shaped protrusions 193 are evenly circumferentially distributed on the inner surface of the first sidewall 191. The extending direction of the strip-shaped protrusion 193 may be parallel to the axial direction of the heating member 19.

The protrusion 193 in FIG. 9 is arcuate, one end of the arcuate protrusion 193 extends in the circumferential direction to the other end, and a plurality of arcuate protrusions 193 are distributed on the inner surface of the first sidewall 191 at intervals in the circumferential direction. Specifically, the four arcuate protrusions 193 are evenly circumferentially distributed on the inner surface of the first sidewall 191. The distribution of the protrusions 193 in FIG. 9 may also be considered as an annular protrusions 193 being broken into four arcuate protrusions 193 in the circumferential direction. A plurality of annular protrusions 193 may be disposed at intervals in the axial direction of the heating member 19, and each annular protrusion 193 has a groove or a through hole, so as to form the second airflow channel 20.

The protrusions 193 in FIG. 10 are dot-shaped, and the dot-shaped protrusions 193 are distributed in an array on the inner surface of the first sidewall 191. Specifically, twelve dot-shaped protrusions 193 are distributed in an array on the inner surface of the first sidewall 191. In another embodiment, the dot-shaped protrusions 193 may alternatively be irregularly distributed on the inner surface of the first sidewall 191. The plurality of dot-shaped protrusions 193 may be distributed in a plurality of rows, each row of dot-shaped protrusions 193 is arranged along the axial direction of the heating member 19, and the plurality of rows of dot-shaped protrusions 193 are disposed at intervals in the circumferential direction of the heating member 19.

The protrusions 193 in FIG. 11 and FIG. 12 are spirally shaped. FIG. 11 is a front view of the heating member 19 provided with the spirally shaped protrusions 193. FIG. 12 is a schematic structural diagram of the heating member 19 provided with the spirally shaped protrusions 193. The spiral protrusion 193 of this embodiment is a non-closing ring, so that the second airflow channel 20 can be formed between the inner surface of the first sidewall 191 and the aerosol-generating substrate 11, and is led from the third opening 192 to the end that is of the aerosol-generating substrate 11 and that is facing away from the third opening 192. In another embodiment, the spiral protrusions 193 may alternatively be disconnected and axially distributed on the inner surface of the first sidewall 191.

In conclusion, the shape and distribution of the protrusions 193 need to enable the second airflow channel 20 to be formed between the inner surface of the heating member 19 and the aerosol-generating substrate 11, and the second airflow channel 20 is led from the top of the heating member 19 to the bottom of the aerosol-generating substrate 11. In another embodiment, the shape and distribution of the protrusions 193 are not limited to the foregoing manner, and may alternatively be in another manner.

Referring to FIG. 7 , in an implementation, a first limiting member 22 is disposed between the outer surface of the first sidewall 191 and the inner surface of the second sidewall 172. The first limiting member 22 limits the heating member 19 to the inside of the heating cavity 173, so that the first airflow channel 21 is formed between the first sidewall 191 and the inner surface of the heating cavity 173.

In this embodiment, the first limiting member 22 is circumferentially sleeved on the outer surface of the first sidewall 191, so that there is a gap between the first sidewall 191 and the heating cavity 173, and the first airflow channel 21 is formed between the first sidewall 191 and an inner surface of the heating cavity 173. The first limiting member 22 has an air hole, and the air hole in the first limiting member 22 can enable an airflow to flow in from the second opening 174, and then flow through the first airflow channel 21 via the air hole in the first limiting member 22, and finally flow to the bottom end of the aerosol-generating substrate 11.

The quantity of the first limiting members 22 may be one or more. In this embodiment, there are two first limiting members 22, which are respectively disposed at the end close to the second opening 174 and the end far from the second opening 174, and simultaneously limit the upper end and the lower end of the heating member 19, so that an airflow can flow from the upper end of the heating member 19 into the first airflow channel 21, and can flow from the lower end of the heating member 19 into the bottom of the aerosol-generating substrate 11.

The first limiting member 22 may be a rubber ring, and the first limiting member 22 may be fastened between the heating base 17 and the heating member 19 in a close fitting and bonding manner, and/or the first limiting member 22 is protruded on the outer surface of the heating member 19, and the first limiting member 22 and the outer surface of the heating member 19 are integrally formed; and/or the first limiting member 22 is protruded on the inner surface of the heating cavity 173, and the first limiting member 22 and the inner surface of the heating cavity 173 are integrally formed. In a manner in which the first limiting member 22 is protruded on the inner surface of the heating cavity 173 or the outer surface of the heating member 19, the shape and distribution of the first limiting member 22 are the same as those in the above manner in which the protrusion 193 is disposed. That is, the protrusion 193 is disposed on the outer surface of the heating member 19 to form the first limiting member 22. The shape and distribution of the first limiting member 22 are not described herein again.

In an implementation, there is a gap between the bottom wall 171 and the aerosol-generating substrate 11, a third airflow channel 23 is formed between the bottom wall 171 and the aerosol-generating substrate 11, and the third airflow channel 23 communicates with the first airflow channel 21 and the second airflow channel 20. The third airflow channel 23 is disposed so that an airflow passing through the first airflow channel 21 and the second airflow channel 20 finally flows to the end that is of the aerosol-generating substrate 11 and that faces away from the third opening 192.

In an implementation, the first sidewall 191 abuts against the bottom wall 171, and the end of the first sidewall 191 close to the bottom wall 171 has an opening, where the opening penetrates through the first sidewall 191 and communicates with the third airflow channel 23 and the first airflow channel 21, so that the airflow of the first airflow channel 21 can lead to the third airflow channel 23, and finally flows to the end that is of the aerosol-generating substrate 11 and that faces away from the third opening 192.

In this embodiment, the first limiting member 22 is disposed between the first sidewall 191 and the second sidewall 172, and the first limiting member 22 is configured to limit the radial direction of the heating member 19 in the heating cavity 173, so that the first sidewall 191 and the bottom wall 171 are disposed at an interval, and the third airflow channel 23 communicates with the first airflow channel 21. The airflow of the first airflow channel 21 can lead to the third airflow channel 23, and finally flow to the end that is of the aerosol-generating substrate 11 and that faces away from the third opening 192.

In this embodiment, a second limiting member 176 is protruded at the end that is of the bottom wall 171 and opposite to the second opening 174, the second limiting member 176 has a through hole, and a fourth opening 194 is formed at the end that is of the heating member 19 and opposite to the third opening 192. The second limiting member 176 is configured to limit the axial direction of the aerosol-generating substrate 11 in the heating cavity 173. The aerosol-generating substrate 11 is inserted into the heating cavity 173 and abuts against the second limiting member 176, so that a gap exists between the bottom of the aerosol-generating substrate 11 and the inner surface of the bottom wall 171, and the third airflow channel 23 is formed. The airflow can flow from the first airflow channel 21 and the second airflow channel 20 into the third airflow channel, and finally flows to the bottom of the aerosol-generating substrate 11.

In a manner in which the second limiting member 176 is disposed on the bottom wall 171, a part or an entirety of the second limiting member 176 protrudes into the fourth opening 194 and abuts against the bottom of the aerosol-generating substrate 11, or the end of the second limiting member 176 close to the fourth opening 194 is flush with the fourth opening 194 and abuts against the bottom of the aerosol-generating substrate 11. That is, the maximum height of the second limiting member 176 is higher than or equal to the maximum distance between the fourth opening 194 and the bottom of the heating cavity 173. In this way, the end that is of the aerosol-generating substrate 11 and that is away from the fourth opening 194 can be disposed inside the heating member 19, and the first airflow channel 21 and the second airflow channel 20 can be more fully used, so that overall temperature distribution of the aerosol-generating substrate 11 is more uniform. The maximum height of the second limiting member 176 is also not easy to be excessively high, the aerosol-generating substrate 11 can be fully baked, and the first airflow channel 21 and the second airflow channel 20 are fully used.

In another implementation, the second limiting member 176 may be protruded at the end that is of the first sidewall 191 and that is close to the bottom wall 171, and the second limiting member 176 abuts against the bottom surface of the aerosol-generating substrate 11, so that the aerosol-generating substrate 11 is limited in the heating member 19. The first limiting member 22 limits the axial direction of the heating member 19 in the heating cavity 173, and at the same time, the aerosol-generating substrate 11 is limited in the heating cavity 173, so that a gap exists between the bottom of the aerosol-generating substrate 11 and the inner surface of the bottom wall 171, and the third airflow channel 23 is formed. The airflow can flow from the first airflow channel 21 and the second airflow channel 20 into the third airflow channel, and finally flows to the bottom of the aerosol-generating substrate 11.

In another implementation, the second limiting member 176 may be protruded at the end of the second sidewall 172 close to the bottom wall 171. The second limiting member 176 abuts against the bottom surface of the aerosol-generating substrate 11 and the end of the first sidewall 191 close to the bottom wall 171, that is, the second limiting member 176 simultaneously limits the aerosol-generating substrate 11 and the axial direction of the heating member 19 in the heating cavity 173. In this implementation, the second limiting member 176 makes a gap between the bottom of the aerosol-generating substrate 11 and the inner surface of the bottom wall 171, and forms the third airflow channel 23. In addition, a gap is formed between the first sidewall 191 and the bottom wall 171, so that the airflow can flow from the first airflow channel 21 to the third airflow channel, and finally flow to the bottom of the aerosol-generating substrate 11.

The foregoing descriptions are merely implementations of the present disclosure, and the patent scope of the present disclosure is not limited thereto. All equivalent structure or process changes made according to the content of this specification and accompanying drawings in the present disclosure or by directly or indirectly applying the present disclosure in other related technical fields shall similarly fall within the patent protection scope of the present disclosure. 

What is claimed is:
 1. An aerosol-generating apparatus, comprising: a heating base having a heating cavity; and a heating member configured to accommodate and heat an aerosol-generating substrate, wherein the heating member is disposed in the heating cavity, wherein the heating member comprises a first sidewall, and a first airflow channel is formed between the first sidewall and an inner surface of the heating cavity, and wherein a protrusion is disposed on an inner surface of the first sidewall, the protrusion makes a second airflow channel formed between the first sidewall and the aerosol-generating substrate, and both the first airflow channel and the second airflow channel are led from the outside of the aerosol-generating apparatus to the bottom of the heating cavity.
 2. The aerosol-generating apparatus of claim 1, wherein the proportion of the area of the surface of the protrusion for contacting the aerosol-generating substrate to the area of the inner surface of the first sidewall is 5%-15%.
 3. The aerosol-generating apparatus of claim 1, wherein the maximum height of the protrusion is 2 mm-5 mm.
 4. The aerosol-generating apparatus of claim 1, wherein the first sidewall is disposed in a ring shape, and wherein the protrusion is spirally disposed on the inner surface of the first sidewall, a plurality of strip-shaped protrusions are disposed on the inner surface of the first sidewall at intervals in a circumferential direction, a plurality of arcuate protrusions are disposed on the inner surface of the first sidewall at intervals in the circumferential direction, a plurality of dotted protrusions are distributed in an array on the inner surface of the first sidewall, or a plurality of annular protrusions are disposed on the inner surface of the first sidewall at intervals in an axial direction, and each annular protrusion has a groove or a through hole.
 5. The aerosol-generating apparatus of claim 1, wherein a first sidewall portion of the first sidewall is concave to form the protrusion.
 6. The aerosol-generating apparatus of claim 1, wherein the first sidewall is disposed in a ring shape, and the heating member is disposed coaxially with the heating base.
 7. The aerosol-generating apparatus of claim 1, wherein the heating base further comprises a second sidewall, wherein a first limiting member is disposed between the first sidewall and the second sidewall, and wherein the first limiting member spaces the first sidewall from the second sidewall to form the first airflow channel between the first sidewall and the inner surface of the heating cavity.
 8. The aerosol-generating apparatus of claim 7, wherein an outer surface of the first sidewall protrudes to form the first limiting member, or wherein an inner surface of the second sidewall protrudes to form the first limiting member.
 9. The aerosol-generating apparatus of claim 1, wherein the heating base further comprises a second sidewall and a bottom wall, wherein the second sidewall and the bottom wall enclose to form the heating cavity, wherein a third airflow channel is formed between the bottom wall and the aerosol-generating substrate, and wherein the third airflow channel communicates with the first airflow channel and the second airflow channel.
 10. The aerosol-generating apparatus of claim 9, wherein a first limiting member is disposed between the first sidewall and the second sidewall, and wherein the first limiting member is configured to limit the heating member for the third airflow channel to communicate with the first airflow channel.
 11. The aerosol-generating apparatus of claim 9, wherein the first sidewall abuts against the bottom wall, and wherein an end of the first sidewall close to the bottom wall has an opening for the third airflow channel to communicate with the first airflow channel.
 12. The aerosol-generating apparatus of claim 9, wherein one of the bottom wall, the first sidewall, or the second sidewall is provided with a second limiting member, and wherein the second limiting member spaces the aerosol-generating substrate from the bottom wall to form the third airflow channel. 